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Technical Articles

Java

javaTutorial

What is the static keyword in Java?

Static members belong to the class itself rather than instances, and can be directly accessed through the class name, including static variables, methods, code blocks and nested classes, used to share data or be called without objects. For example, only one copy of the static variable is shared by all instances, static methods can be called directly but only static members can be accessed. Static code blocks are executed once when the class is loaded for initialization. Static nested classes can be created independently of external class instances, and static members are only loaded once in memory. They are often used in tool methods, constant definitions and configuration settings, but abuse should be avoided to prevent code coupling.

Aug 15, 2025 am 02:54 AM

what are lambda expressions in java 8

LambdaexpressionsinJava8solvetheverbosityofanonymousinnerclassesbyprovidingaconcisewaytorepresentinlineimplementationsoffunctionalinterfaces,enablingfunctionalprogrammingfeatures;theysimplifycodesuchasreplacingverboseRunnableimplementationswith()-&gt

Aug 15, 2025 am 02:38 AM

Calculate grade points based on letter grades and output

This article aims to guide readers on how to write a Java program that accepts letter grades entered by the user and returns the corresponding grade points based on the grade. The program contains an exception handling mechanism, which can effectively handle invalid letter level inputs and output corresponding error prompt information to ensure the robustness of the program and user experience.

Aug 15, 2025 am 02:27 AM

How to call C code from Java?

To call C code from Java, the standard method is to use JavaNativeInterface (JNI), implement it as a shared library by defining native methods, generating header files, writing and compiling C, and finally loading the library in Java. The entire process needs to ensure that the naming is consistent and cross-language data type conversion is handled. Finally, the successful call will output HellofromC! .

Aug 15, 2025 am 02:01 AM

java c language

What is the toString() method in Java?

ThetoString()methodinJavareturnsastringrepresentationofanobjectandshouldbeoverriddentoprovidemeaningfuloutput;1.Bydefault,itreturns"ClassName@hashcode",whichisnotinformative;2.Overridingitimprovesdebugging,logging,anduser-friendlyoutput;3.B

Aug 15, 2025 am 01:53 AM

Configuring JPA Metamodel Generator in Gradle Project

This article aims to guide developers on how to integrate JPA Metamodel Generator in Gradle projects to simplify type-safe JPA query development. By removing the plug-in version declaration and correctly configuring the compile parameters, common build failure problems can be effectively solved, thereby improving development efficiency and code quality.

Aug 15, 2025 am 01:45 AM

How to get user input in Java?

TogetuserinputinJava,usetheScannerclassfromjava.util.2.ImportScanner,createaScannerobjectwithSystem.in,usemethodslikenextLine()ornextInt()toreadinput,andclosethescannerwithclose().3.BecautiouswhenmixingnextInt()andnextLine()—addanextranextLine()after

Aug 15, 2025 am 01:42 AM

java user input

How to handle StackOverflowError in Java?

AStackOverflowErrorinJavaiscausedbyexcessiveorinfiniterecursion,anditcanbepreventedbyfixingrecursivelogic,usingiterationinsteadofdeeprecursion,andavoidingcircularreferencesinmethodsliketoString().Toresolveit,firstidentifytherootcause—suchasmissingbas

Aug 15, 2025 am 01:27 AM

java

How to format currency in Java

Use the NumberFormat class to easily implement currency formatting in Java. 1. Use NumberFormat.getCurrencyInstance() and pass in Locale to format currency by region. 2. The formatting result automatically contains the correct currency symbols, decimal points and thousand separators. 3. It is not recommended to manually set the decimal number. The default rules of locale should be relied on. 4. If you need to specify a currency type (such as USD, EUR), you can use the setCurrency() method in combination with the Currency class. 5. Always use the locale mechanism instead of hard-coded symbols to ensure international compatibility. Finally, the format() method returns the words suitable for display.

Aug 15, 2025 am 12:56 AM

What is a try-catch block in Java?

Atry-catchblockinJavahandlesexceptionstopreventprogramcrashesbyallowinggracefulerrorrecovery;itworksbyenclosingriskycodeinatryblockandmanagingspecificexceptionsincorrespondingcatchblocks,suchasArithmeticExceptionfordivisionbyzeroorArrayIndexOutOfBoun

Aug 15, 2025 am 12:32 AM

How to use the Scanner class in Java

Importing the Scanner class requires adding importjava.util.Scanner at the top of the file; 2. Creating a Scanner object can read input from System.in, string or file, such as Scannerscanner=newScanner(System.in); 3. Use next(), nextLine(), nextInt() and other methods to read different types of data. Note that nextLine() needs to be called extra once after nextInt() to clear newline characters; 4. Always use scanner.close() to close resources to prevent leakage; 5. Use hasNextInt() and other methods to input

Aug 15, 2025 am 12:30 AM

Tracking Java runtime annotation processor with conditional breakpoints

This article aims to solve the underlying logic of how to locate the third-party library to process runtime (RUNTIME) annotations in Java development. When the IDE's "Find Usage" function cannot meet the needs, we will introduce an efficient debugging strategy. By setting conditional breakpoints on the Class.isAnnotationPresent method, developers can accurately track the code location and call stack where a specific annotation is consumed, thereby revealing the internal mechanism of the annotation processor, although this may bring some debugging performance overhead.

Aug 14, 2025 pm 11:48 PM

Common pitfalls and best practices in Oracle database date addition and subtraction operations

This article aims to explore in-depth common problems caused by implicit type conversion and improper NLS date formatting when performing date addition and subtraction operations in Oracle databases, especially year calculation errors across centuries. We will parse the root of the problem in detail and show through sample code how to adopt direct date arithmetic and appropriate functions (such as TRUNC) to avoid unnecessary type conversions and ensure the accuracy and reliability of date calculations, especially when performing SQL updates in Java code.

Aug 14, 2025 pm 11:45 PM

Simplify the way to find maximum and minimum values in an array

This article aims to provide an efficient and concise way to merge two similar methods of finding array maximum and minimum values into one. By introducing the Comparator interface, custom comparison logic is implemented, so that two operations can be completed in just one method. This not only reduces code redundancy, but also improves code maintainability and flexibility.

Aug 14, 2025 pm 11:42 PM